Feature: Display: 1.5 inch CSTN Screen Picture Resolution: 128*128 CSTN Solution: Appotech Power saving mode: 120seconds automatically shut down Build-in NADA flash: 16M (104 photoes) support clock function,Calander display function Formats Supported: BMP,JPG,PNG and TIF Display mode: Manual or Auto OS support : Win98/ME/NT/2000/XP Power supply: build-in 3.7v Lithium Battery or 5v USB Battery working period: 4-5 hours Accessories: key chain, Manual and USB Cable.